[issue12760] Add create mode to open()

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset ef406c4c6463 by Charles-François Natali in branch 'default':
Issue #12760: Add some mising documentation about the new `x` exclusive
http://hg.python.org/cpython/rev/ef406c4c6463

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